What would happen if my coil wasn't getting enough power? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-26-2004, 12:06 AM
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What would happen if my coil wasn't getting enough power?

i think my coil may not be getting a good feed of power. What would be some things that it might cause? I've got a pretty good miss at idle, even thought my timing is on and it backfires no matter where i time it to. i don't think it's the rocker arms cuz i just readjusted them, but if the are loose i'm gonna have to take a look at my cam even though it's a fairly new racing cam, guess it could be worn down. But do you think it could not be firing to certain cylinders at idle? for the backfiring, maybe it isn't sending spark hot enough to burn up all the gas? what could solve these problems really it's nothin to bad, it still runs and doesn't die at idle. but it's annoying when i'm trying to show off.

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Old 04-26-2004, 05:14 AM
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Pull the wires off at the coil, look at the color of the spark. You should have a nice bluish spark
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Old 04-26-2004, 06:07 AM
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Check the ground on the coil.Make sure you have a good ground.Is the backfire on the intake or exhaust?
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Old 04-26-2004, 11:14 AM
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k i checked it out and i'm only getting about 5.5 volts to my coil, and the backfire is on the exhaust. The truck still runs and has good power but 5.5 volts just doesn't seem like a lot, i thought it had to be about 12 volts.
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Old 04-26-2004, 12:09 PM
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Coils are VERY old technology and modern ones are hold over from the old 6V days. Any coil should only see 5.5-6V on the primary side. Putting a full 12V on it would burn it out in short order. There is a ballast resistor in the circuit that is dropping coil voltage to that level on purpose. Look elsewhere for your ignition troubles, it doesn't sound like a coil problem.
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Old 04-26-2004, 04:00 PM
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Thanks i didn't know that before. it's good to know i donm't have a problem!!!!
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